Is there an iPad app to play movies from an SD card?Yes you can view them from the Photos app. I was hoping that SDK access to the Kit would be possible and somebody came up with a movie player. That would be a nice open source project, so devs could compile the sources as an adhoc app (no jailbreaking required).

What iPhone apps can't you live without?I'm forced to use both: SoundHound is generally better at finding a song. I had many situations where Shazam didn't know a song but SoundHound found it easily. However, SoundHound isn't sensitive enough. As an example it's not possible at all to catch a song from the radio in my office. Shazam on the other hand seems to adapt and can easily record songs also from this same radio.